This is the mobile shell client. You should go read more about mosh at mosh.mit.edu if you dont know about it yet. In short it is a new mobile part-replacement for ssh. The authentication is made using normal ssh, but then you need to have mosh-server installed on the server. This means that you need to install mosh also on your server and you also need to allow UDP port range 60000-61000 on the server firewall if it has such before this is of any use to you. The plus sides are that roaming works - your ip can change and the connection will not die - and there is a predictive input system eliminating some of the lag.
Negatives are no port or X11 forwarding.